Laser/lights are great on certain guns in certain conditions. I have the Veridian Green Laser + Tactical Light sights on a couple of my guns. One is on my Beretta PX4 Storm .45 who's duty is mainly as a house gun. The other is on a Ruger SR22. The green laser shows better in daylight than the red. I have Crimson Trace red lasers on my LCR .38 and LCR .22. My main carry is a Springfield XDS .45acp and I don't feel the need for a laser on that gun.
The SR22 with a Viridian Green Laser/light
Beretta .45 with Viridian green laser/light
I was lucky to find a LH Fobus pancake holster to accomadate the laser on the Beretta